Tractor



FIG. 1 is a front view of a tractor in accordance with the presentinvention, with the broken line showing the environment for illustrativepurposes only and forming no part of the claimed design;

FIG. 2 is a rear view of the tractor shown in FIG. 1;

FIG. 3 is a left side view of the tractor shown in FIG. 1;

FIG. 4 is a right side view of the tractor shown in FIG. 1;

FIG. 5 is a top plan view of the tractor shown in FIG. 1;

FIG. 6 is a perspective view of the tractor shown in FIG. 1;

FIG. 7 is an enlarged perspective view of the lower portion of the rearhalf of the tractor shown in FIG. 1; and,

FIG. 8 is an enlarged front view of the part of the tractor shown inFIG. 1, which is the subject of the present application and inaccordance with the present invention.

The ornamental design for a tractor, as shown and described.